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    <title>Line chart &#124; the D3 Graph Gallery</title>
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        <h1>Line chart</h1>
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        <p style="max-width: 700px; margin: auto">
          This is the
          <a href="https://www.data-to-viz.com/graph/line.html">line chart</a>
          section of the gallery. If you want to know more about this kind of
          chart, visit
          <a href="https://www.data-to-viz.com/graph/line.html"
            >data-to-viz.com</a
          >. If you're looking for a simple way to implement it in d3.js, pick
          an example below.
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        <div class="mySeryTitle">Step by step</div>
        <hr />
        <p>
          Line chart are built thanks to the <code>d3.line()</code> helper
          function. I strongly advise to have a look to the
          <a href="https://www.d3-graph-gallery.com/graph/shape.html#myline"
            >basics of this function</a
          >
          before trying to build your first chart. First example here is the
          <a href="graph/line_basic.html">most basic line plot</a> you can do.
          Next one shows how to display
          <a href="graph/line_several_group.html">several groups</a>, and how to
          use <a href="graph/line_smallmultiple.html">small multiple</a> to
          avoid the
          <a href="https://www.data-to-viz.com/caveat/spaghetti.html"
            >spaghetti chart</a
          >.
        </p>
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            <a class="portfolio-link" href="graph/line_basic.html">
              <div class="portfolio-hover">
                <div class="portfolio-hover-content">
                  <p>Most basic</p>
                  <hr />
                  <p class="explanation_portfolio">
                    The most basic line chart you can do in d3.js. Keeping only
                    the core code.
                  </p>
                </div>
              </div>
              <img class="img-fluid" src="img/graph/line_basic.png" alt="" />
            </a>
          </div>
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            <a class="portfolio-link" href="graph/line_several_group.html">
              <div class="portfolio-hover">
                <div class="portfolio-hover-content">
                  <p>Several groups</p>
                  <hr />
                  <p class="explanation_portfolio">
                    Learn how to represent several groups on the line plot. This
                    requires to group the data using the d3.nest function.
                  </p>
                </div>
              </div>
              <img
                class="img-fluid"
                src="img/graph/line_several_group.png"
                alt=""
              />
            </a>
          </div>
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            <a class="portfolio-link" href="graph/line_smallmultiple.html">
              <div class="portfolio-hover">
                <div class="portfolio-hover-content">
                  <p>Small multiple</p>
                  <hr />
                  <p class="explanation_portfolio">
                    Learn how to apply the small multiple technique on line
                    plot. It allows to avoid the spaghetti plot where lines
                    become unreadable.
                  </p>
                </div>
              </div>
              <img
                class="img-fluid"
                src="img/graph/line_smallmultiple.png"
                alt=""
              />
            </a>
          </div>
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              class="portfolio-link"
              href="graph/line_confidence_interval.html"
            >
              <div class="portfolio-hover">
                <div class="portfolio-hover-content">
                  <p>Confidence interval</p>
                  <hr />
                  <p class="explanation_portfolio">
                    Display confidence interval around main trend
                  </p>
                </div>
              </div>
              <img
                class="img-fluid"
                src="img/graph/line_confidence_interval.png"
                alt=""
              />
            </a>
          </div>
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            <a class="portfolio-link" href="graph/line_color_gradient_svg.html">
              <div class="portfolio-hover">
                <div class="portfolio-hover-content">
                  <p>Color gradient</p>
                  <hr />
                  <p class="explanation_portfolio">
                    How to apply a color gradient on the line that is a unique
                    svg element
                  </p>
                </div>
              </div>
              <img
                class="img-fluid"
                src="img/graph/line_color_gradient_svg.png"
                alt=""
              />
            </a>
          </div>
        </div>

        <br /><br />
        <div class="mySeryTitle">Interactivity: switch data</div>
        <hr />
        <p>
          Three examples showing how to <u>switch</u> from one data series to
          another with smooth transition. <u>Three</u> situations are described.
          <u>1/</u> series are stored in
          <a href="graph/line_change_data.html">different input file</a>.
          <u>2/</u> series are stored in the same dataset, each in a
          <a href="graph/line_select.html">different columns</a> (wide format).
          <u>3/</u> same dataset, same column: long or tidy format.
        </p>
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            <a class="portfolio-link" href="graph/line_change_data.html">
              <div class="portfolio-hover">
                <div class="portfolio-hover-content">
                  <p>1/ Transition between<br />input data</p>
                  <hr />
                  <p class="explanation_portfolio">
                    Add a button that allows to go from one dataset to another
                    with a smooth transition. Useful to understand how to build
                    a <code>update()</code> function.
                  </p>
                </div>
              </div>
              <img
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                src="img/graph/line_change_data.gif"
                alt=""
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            </a>
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            <a class="portfolio-link" href="graph/line_select.html">
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                <div class="portfolio-hover-content">
                  <p>2/ Transition between<br />column of input</p>
                  <hr />
                  <p class="explanation_portfolio">
                    Dropdown button controls which columns of the dataset is
                    displayed on the chart.<br /><br />Wide format
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              <img class="img-fluid" src="img/graph/line_select.gif" alt="" />
            </a>
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                <div class="portfolio-hover-content">
                  <p>3/ Transition between<br />value of a column</p>
                  <hr />
                  <p class="explanation_portfolio">
                    Dropdown button controls which value of a column is
                    displayed on the chart.<br /><br />Long format
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        <br /><br />
        <div class="mySeryTitle">Interactivity: other</div>
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        <p>
          Interactivity can also be useful to zoom on a part of the chart or
          highlight a specific set of the chart
        </p>
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              <div class="portfolio-hover">
                <div class="portfolio-hover-content">
                  <p>Brush for zooming</p>
                  <hr />
                  <p class="explanation_portfolio">
                    How to use Brush to zoom on a specific part of the line
                    chart.<br /><br />Double click to reinitialize
                  </p>
                </div>
              </div>
              <img
                class="img-fluid"
                src="img/graph/line_brushZoom.gif"
                alt=""
              />
            </a>
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                <div class="portfolio-hover-content">
                  <p>Add cursor for exact value</p>
                  <hr />
                  <p class="explanation_portfolio">
                    Recover the closest X position in the dataset and display
                    its exact value
                  </p>
                </div>
              </div>
              <img class="img-fluid" src="img/graph/line_cursor.gif" alt="" />
            </a>
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